


price = 0.50
count = 1
sl = 0.13

d = round((price * count) / (1 + sl) * sl, 2)
d1 = round(price - d, 2)
print(f"{d} = ({price} * {count}) / (1+{sl}) * {sl}")
print(f"{d1} = {price} - {d}")



# 商品单行合计金额 = 商品价格 + 包装费 + 运费 - 运费优惠金额
# line =

